Sound waves travel fastest in
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  • 1
    The equation of progressive wave is $y = a\sin (200\,t - x)$. where $x$ is in meter and $t$ is in second. The velocity of wave is  ..... $m/sec$
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  • 2
    Spacing between two successive nodes in a standing wave on a string is $x$ . If frequency of the standing wave is kept unchanged but tension in the string is doubled, then new spacing between successive nodes will  become
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  • 3
    Each of the properties of sound listed in column $A$ primarily depends on one of the quantities in column $B$. Choose the matching pairs from two columns

    Column $A$          Column $B$

    Pitch                   Waveform

    Quality                Frequency

    Loudness            Intensity

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  • 4
    The figure shows four progressive waves $A, B, C$ and $D $ with their phases expressed with respect to the wave $A$. It can be concluded from the figure that
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  • 5
    A sonometer wire, with a suspended mass of $M = 1\, kg$, is in resonance with a given tuning fork. The apparatus is taken to the moon where the acceleration due to gravity is $(1/6)$ that on earth. To obtain resonance on the moon, the value of $M$ should be ......... $kg$
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  • 6
    A source and an observer move away from each other with a velocity of $10\; m/s$ with respect to ground. If the observer finds the frequency of sound coming from the source as $1950 \;Hz$, then actual frequency of the source is .... $Hz$ (velocity of sound in air = $340\; m/s$)
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  • 7
    Equation of the progressive wave is given by : $y = a\sin \pi (40t - x)$ where $a$ and $x$ are in metre and $t$ in second. The velocity of the wave is  ..... $m/s$
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  • 8
    The equation of a progressive wave is $y = a\,\sin \,\left( {\frac{\pi }{2}x - 200\pi t} \right)$ . The frequency of the wave will be .... $Hz$
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  • 9
    A speaker emits a sound wave of frequency $f_0$. When it moves towards a stationary observer with speed $u$, the observer measures a frequency $f_1$. If the speaker is stationary and the observer moves towards it with speed $u$, the measured frequency is $f_2$. Then,
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  • 10
    Two sound waves of slightly different frequencies propagating in the same direction produce beats due to
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